Portative internal combustion percussive tools



75955 A. N. WAMPACi-i VE INTERNAL COMBUSTION PERCUSSIVE TOOLS PORTATI Filed April 21, 1953 INVENTOR. Algae Nicolas WAMPAQTH ifs M Wi Attorney United States Patent Ofiice 2,727,497 Patented Dec. 20, 19 55 PORTATIVE INTERNAL COMBUSTION PERCUSSIVE TOOLS Aloyse Nicolas Wampach, Luxembourg, Luxembourg Application April 21, 1953, Serial No. 350,136 Claims priority, application Luxembourg April 23, 1952 4 Claims. (Cl. 123-7) atmosphere when the said push-rod is in its highest position.

The characteristic features of the apparatus according to the invention will become apparent in the course of the description which follows, with reference to the appended drawings which represent as an example a preferred embodiment of the invention. In these drawings:

Fig. 1 is a vertical axial section of the ramming tool;

Fig. 2 is a plan;

Fig. 3 is a sectional elevation, on a larger scale, of the locking mechanism of the push-rod.

In apparatus of the type referred to, that are known of the piston is obtained by means of a spnng in compression; the present invention resides principally in the substitution of a spring in tension housed inside the percussion bar, instead of the spring in compression.

As shown in Fig. 1, the ramming tool according to the invention consists in a body 21 the lower portion of which is a base containing the fuel tank 20 and the evaporative device 26, while the upper portion constitutes the cylinder in which reciprocates the piston 1 which is separate from a percussion bar 2 on which is secured the foot 14 constituting the ram, which this piston actuates through the intermediary of a sliding rod 6 independent from the said piston.

The arrangement of the spring for efiecting the recoil of the piston 1 comprises a spring under tension adapted 6. The spring 5 is anchored at the top of the percussion bar 2 by means of a pin 50, and its lower end is secured to a plug 7 against which presses the lower end of the sliding rod 6.

The handle bars are fixed to a yoke 8 to which is secured the push-bar 3, which is formed of two parts, the upper one of which is bored axially to receive the end of the lower part, of lesser diameter, held in the said axial bore by a bolt 4b and actuated by the compression spring 4a.

The push-rod 3 is constructed in two parts 3 and 4 in order to prevent, if the operator should inadvertently push down the operating yoke 8, and consequently the pushrod, before the piston 1 has been completely pushed back 2 against the cylinder head 16 by the sliding rod 6 under the thrust of the spring 5, the piston 1 from descending plosive mixture, so that the force of impact of the ram 14 would be diminished.

This risk is removed by the arrangement just described, shown in greater detail in Fig. 3 on an enlarged scale. In the highest position of the yoke 8, the spring-controlled catch 9 slides under the surface 10 of the lower end of the push-rod 3 and maintains this latter recoil stroke, forces back the catch 9, this action being facilitated by a bevel provided under the catch 9, which which guides it and retains it in position.

Owing to the construction of the push-rod in two parts, another great advantage is obtained, namely that, when the recoil of the piston 1 takes place, the two parts 3 and 4 slide inside each other and close the orifices 11 which put in communication the combustion chamber 22 with the atmosphere. After the remaining burnt gases ensured thereby along the Whole of its length.

A spring 12 under tension is also provided to effect the recoil of the foot 14 of the ramming tool. To this end, the percussion bar 2 is bored along its Whole length and the tension spring 12 is anchored to the pin 13, solid with the foot 14, as shown in Fig.1.

The ignition magneto (Fig. 2) is mounted in a known manner on the head 16 and is connected by the cable 17 to the sparking plug 18. Its circuit-breaker lever is actuated by an adjustable finger 19 mounted on the yoke 8.

The liquid fuel is stored in the tank 20 in the lower adjustable valve 25, provided on the pipe 23, is provided for the adjustment of the secondary air. The liquid fuel evaporates along the surface of wicks 26 which are suscirculate between the wicks, the gaseous mixture proceeding along the pipe 23. The exhaust port for the burnt gases is shown at 30; 31 is a bolt enabling the tension of the spring 12 to be adjusted. In the foot of the ramming tool are disposed india-rubber rings 32 adapted to absorb the vibrations of the ram.

voltage current from the magneto 15 when the finger 19 circuit-breaker lever of the magneto, during the descent of the yoke 8.

The effect of the explosion is to throw upwards the whole body of the ramming tool. During this instantaneous throw of the body, the piston is pushed down,

orifice. The spring 5 is stretched at the same time.

As soon as the body of the ramming tool has left the ground, the foot 14, solid with the percussion bar 2, slides out of the body and remains suspended, separated thebody. However-,"the tension spring 12 having 2.' A portable internal combustion ramming tool, as been considerably stretched during this upward throw, claimed in.claim 1, wherein said means for actuatingthe immediately brings back the foot and the percussion bar piston comprise a push-rod slidably mounted on the upbefore the body falls back on the ground and exerts its per portion of the said body, a yoke to which the said mthumping' action. 5 push-rod is secured, handles on the said yoke, the said -;?At:the sametimefithe, spring 5 brings back the piston 3. push-rod being constituted. by two co-axial parts, the towards thercylinder head :16 and evacuates, as described lower one having its upper portion of reduced diameter above, the :remaining burnt'gasesthrough therzorifices 11 engaging a corresponding bore in the upper part in which of the part 4 of the push-rod" 3. ii'ln. thisrmanner the bore it is slidably-held by means of acbolt under control -=combustion chamber has become emptyso as tocause of a compression spring, "an axial passage in thetlower -.theautomatic descent :of the yoke, of the push-red pazt'ofthe push-rod, a port putting the said passage in of the: piston, 'duringthe fall of the body of the ramming communication with the combustion chamber, a second 1 tool, thereby causing a new aspirationof explosive mixport putting the said passage in communication withthe ture with a 'new subsequent explosion, so that the working atmosphere, said "second" port being covered when'"the J cycle-of therammingtool isirepeated. 15 lower part of the said; push-rod penetrates into the bore 'What I claim is: of the upper part thereof. 1. In a portable internal'combustion ramming tool, a 3. A portable internal combustion ramming tool, as body, a tank for liquidfuel in the lower part of the said eiaimed in claim 1, wherein said means for actuating the /-body,=-means for vaporising the said fuel in the lower part piston comprise a push-rodslidably mounted on the upof the said body,- a :cylinder in the upper part of the per portion of the said body, a yoke to which the said said body, a piston in the said cylinder, a combustion push-rod is secured,- handles onthe said yokejthe-said chamber at the topofthe said cylinder, over the said push-rod being constituted by two co-axial telescopic parts i m passage;fr()m the said vaporising means to the under spring control, a spring controlled catch adapted said combustion chamber, for an explosive mixture, means to lock the pp P of the Said P and the 'said ,for exploding the said explosive mixture, an exhaust for yoke in their highest-position'and means for pushing the the burnt gases, arpercussion bar adapted to slide vertisaid catch outof action when the piston is at the top callyin the said body, said percussion bar being bor d -of its recoil stroke, said latter means comprising coalong its whole length, a ram connected to the lower end engaging bevcls on said catch and on the lower part of of the said percussion bar, a helical spring housed within the Said P P Y- th id i 'b d secured th et t th t 4.111 a portable internal combustion ramming tool, as h f, h he l n d of. the said spring bein claimed in claim 1, a helical spring in the lower portion secured to a 'plugmember-adapted to slide inside the 0f 'ihfiv b01'6 0f Percussioh'bar, Secured at 6 6nd t0 ,-said percussion bar; axsliding tubular rod pressing at its the Said yother end t a d ram.

v-upper-endzagainst and underneath the said piston and at its lower end resting on the saidlplug member and means for actuating the said piston.

No references cited. 

